A 2.0 g bead slides along a frictionless wire, as shown in the figure. At point A, the bead is moving to the right but with negligible speed
(a) What is the potential energy of the bead at point A?
(b) What is the kinetic energy of the bead at point B?
(c) What is the speed of the bead at point B?
(d) What is the speed of the bead at point C?
What will be an ideal response?
Answer: (a) 2.0 × 10-2 J (b) 2.0 × 10-2 J (c) 4.4 m/s (d) 2.0 m/s
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When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
A. can be increased by shifting mass out away from the axis of rotation. B. can be decreased by shifting mass out away from the axis of rotation. C. can be increased by shifting mass in toward the axis of rotation. D. can be decreased by shifting mass in toward the axis of rotation. E. cannot be changed except by friction at the point of contact.
The coldest region of the atmosphere is the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.
Why don't eclipses occur at every new Moon and full Moon?
What will be an ideal response?
Suppose you are facing a tall makeup mirror on a vertical wall. Fluorescent tubes framing the mirror carry a clockwise electric current. What is the direction of the magnetic field created by that current at the center of the mirror?
1.left 2.right 3.horizontally toward you 4.horizontally away from you 5.no direction because the field has zero magnitude